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Old 08-18-2013, 03:45 PM   #1
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Coil pack

So browsing through AM I see a few different coil pack.

Which is the best for my buck?

Was looking into Screaming Demon since it came with 2.
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Old 08-18-2013, 04:37 PM   #2
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Oem.
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Old 08-18-2013, 04:46 PM   #3
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I've been doing A LOT of research lately on coil packs. I have a 06' v6 with the stock ignition coil at 120,000+ miles so its definitely time to swap it out.

Any who, I really like accel. It's inexpensive and designed for performance (along with the others; screaming demon, etc). It's more personal preference, patience and your budget.
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Old 08-19-2013, 06:36 PM   #4
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I've been doing A LOT of research lately on coil packs. I have a 06' v6 with the stock ignition coil at 120,000+ miles so its definitely time to swap it out.

Any who, I really like accel. It's inexpensive and designed for performance (along with the others; screaming demon, etc). It's more personal preference, patience and your budget.
What makes you feel that just because it has 120k on it it is "definitely time to swap it out"? I have a friend with a '98 Cobra with over 200k miles on the original packs, my 1990 Miata ran 345k miles (when I sold it and the new owner put another 80k on it) on the original coil packs,
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Old 08-19-2013, 08:16 PM   #5
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My 98 has the original coil packs AFAIK (previous owner says he never changed them and he had the car at 20k miles). So my coil packs just turned over 116k miles and 15 years old and the car still pulls hard up to the limiter without missing a beat.

Honestly I LOVE the coil pack setup, no having to pay $45 per COP, they can support higher RPMs and the OEM Ford units last forever. You can also hide them behind the intake if you had them in the stock location or need to move them for a TT kit or something.
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Old 08-19-2013, 08:20 PM   #6
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Yeah them damn COPs
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Old 08-19-2013, 08:27 PM   #7
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Ford issued a TSB (03-14-4) stating in part that "Approximately 50% of COP coils returned for warranty do not have a problem.", and urging dealers to test them more carefully. In the "indy" (independent mechanics) world customers pay to have good ones replaced even more often.

I had asked some time back for people to send me their "bad" COPs so that I could test my COP-Testo the Destructor test fixture:



I received over 40 COPs, only 9 were bad the rest had nothing wrong with them and were capable of delivering their full capacity.

They are the most needlessly replaced component on any engine using them...
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New ride (7/1/2013) 1998 Mercedes SL500-5.0L 32V VVT 326/347 HP/tq
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Old 08-19-2013, 08:31 PM   #8
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So they were replacing because they thought they were old and needed replaced? No real reason the replaced?
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Old 08-19-2013, 08:55 PM   #9
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So they were replacing because they thought they were old and needed replaced? No real reason the replaced?
They thought they were defective because the did not know any better. The output from COPs is so strong (high voltage and power) that bad boots and or the spring connector, just a bit of moisture/grime in the plug well, or a marginal plug will cause a misfire with a perfectly good COP. Fueling and other issues will also cause the misfire monitor to throw a DTC, but an illiterate mechanic will automatically think "ignition" when misfires occur.

An ignition coil, be it a single coil, coil pack or COP, is just a transformer. Unless overheated (due bad boots/wires, plugs, or other bypass of the high voltage discharge) or physically damaged they will last forever. On the old single coil systems, on a V8, the coil fired 4 times for each engine revolution. With the Ford EDIS dual coil pack each coil fires once for each engine revolution.

COPs only fire once every other revolution, 1/8th the duty cycle of the old systems and 1/2 that of the EDIS. If the plugs and boots are changed as required they will outlive all of us.

Problems happen when people let the plugs get worn (for example expecting plain ol' "copper" plugs to last more then 25k miles), or decide to wash the engine and drown the plug wells, or never change the boots which should be changed at 100k when the OEM plugs are changed...
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Steeda UDPs, Ralco flywheel, RAM HDX clutch, 3.73s, 262 rwHP/305 lb-ft.

New ride (7/1/2013) 1998 Mercedes SL500-5.0L 32V VVT 326/347 HP/tq
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Old 08-19-2013, 09:01 PM   #10
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So can you clean the boots before 100k miles? So the boots need changed but the cop is still good in most cases right?
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Old 08-19-2013, 09:06 PM   #11
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Hmmm, I have to do the plugs in my Expy soon (dreading it). Truck is at 106k miles and does not miss a beat. Will probably just do the boot change with the plugs after cursing life and digging them out with the plug removal tool for OEM Triton plugs...
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Old 08-19-2013, 09:07 PM   #12
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Originally Posted by cliffyk View Post

What makes you feel that just because it has 120k on it it is "definitely time to swap it out"? I have a friend with a '98 Cobra with over 200k miles on the original packs, my 1990 Miata ran 345k miles (when I sold it and the new owner put another 80k on it) on the original coil packs,
Personally, I feel mine needs to be replaced because of its current idling and delayed acceleration response. Plus, I have the extra money set aside to go down that trial and error path. Other than that, I believe that ignition coils can last for hundreds of thousands of miles.
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Old 08-19-2013, 09:07 PM   #13
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So can you clean the boots before 100k miles? So the boots need changed but the cop is still good in most cases right?
Replace (I never said "clean") the boots at 100k miles, the recommended service interval for the platinum OEM plugs. If your plugs have not been changed at 120k miles then they are well past due to be changed, if they have been changed then pull the COPs and replace the boots. They and new conductor springs can be had for $3 a pop for this vendor--or for $5 to $7 each at most FLAPS.

Doing this will mean you will never have to replace a COP...
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SOLD! - 2003 GT, UPR X, FRPP 24lb/h, Magnaflow, PP 70mm TB & plenum, Delta Force tuned,
Steeda UDPs, Ralco flywheel, RAM HDX clutch, 3.73s, 262 rwHP/305 lb-ft.

New ride (7/1/2013) 1998 Mercedes SL500-5.0L 32V VVT 326/347 HP/tq
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Old 08-19-2013, 09:08 PM   #14
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Well after him posting that I wouldn't spend any extra money when that many were good.
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Old 08-19-2013, 09:09 PM   #15
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Dammitt Cliffy. I just bought 8 of them. My car had the original plugs till 135k though... Not so cheap insurance I guess.
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Old 08-19-2013, 09:14 PM   #16
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Personally, I feel mine needs to be replaced because of its current idling and delayed acceleration response. Plus, I have the extra money set aside to go down that trial and error path. Other than that, I believe that ignition coils can last for hundreds of thousands of miles.
If the engine runs strongly without misfiring under higher loads and lower rpms (accelerate briskly in 3rd from 35 mph) then it is highly unlikely the COPs are at issue. Instead check the plugs, COP boots for signs of hardening or cracking (or smelling "burned"). Also sticking, gummed up, injectors or a sticking EGR valve can cause the symptoms you describe.

How many miles of the car, when were the plugs/boots last changed?
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SOLD! - 2003 GT, UPR X, FRPP 24lb/h, Magnaflow, PP 70mm TB & plenum, Delta Force tuned,
Steeda UDPs, Ralco flywheel, RAM HDX clutch, 3.73s, 262 rwHP/305 lb-ft.

New ride (7/1/2013) 1998 Mercedes SL500-5.0L 32V VVT 326/347 HP/tq
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Old 08-19-2013, 09:14 PM   #17
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Well he did say that 9 out of 40 were bad so that is around a 25% failure rate from "bad" ones. But that is just ones that owners or crappy techs thought were bad. This means if you have a set of 8 just purring along your odds of a bad one are not very high.
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Old 08-19-2013, 09:16 PM   #18
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Dammitt Cliffy. I just bought 8 of them. My car had the original plugs till 135k though... Not so cheap insurance I guess.
35k past the recommended plug change (135% of the recommended service life) is enough to have compromised the COPs, not 100% likely but possible.

As the plug gap erodes the COP has to dump more of its charge to ionise the gap and initiate the spark:



Normally the COP dumps only a small fraction (less than 1/20th) of its charge at each spark event, however as you ask it to work harder it heats up more until it will burn out through degradation of the insulation on the coil windings. I can force this with my COP-Testo the Destructor by firing the COP across a 5/8" gap 20 to 25 times in rapid succession. The COP will get so hot you cannot hold it in your hand, and the magic smoke comes out (BTW, I tested some Accel COPs and could burn out one of those in 12 to 15 rapid full dumps).

Here is a video of a stock COP firing six times across a 16 mm (5/8") gap.

One last thing as an FYI. At idle and up to 1200 rpm or so the COPs fire three times at each ignition event to improve combustion efficiency and emissions. This is a good example of how much reserve capacity each COP has:

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SOLD! - 2003 GT, UPR X, FRPP 24lb/h, Magnaflow, PP 70mm TB & plenum, Delta Force tuned,
Steeda UDPs, Ralco flywheel, RAM HDX clutch, 3.73s, 262 rwHP/305 lb-ft.

New ride (7/1/2013) 1998 Mercedes SL500-5.0L 32V VVT 326/347 HP/tq
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Old 08-19-2013, 09:23 PM   #19
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35k past the recommended plug change (135% of the recommended service life) is enough to have compromised the COPs, not 100% likely but possible...
The gaps were above .085.
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Old 08-19-2013, 09:29 PM   #20
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I have a misfire at idle and slower speeds in like first 10-15mph so i might trying cleaning these boots, or even replacing them. How can i go about cleaning them? Anything special?
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1998 cummins - 150hp injectors | FASS fuel kit | 4" straight pipe | 5" lift | BHAF | 20" wheels | edge juice w/ attitude | built auto trans with stall | closing in on 900tq | bigger turbo soon..

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Old 08-19-2013, 09:35 PM   #21
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I have a misfire at idle and slower speeds in like first 10-15mph so i might trying cleaning these boots, or even replacing them. How can i go about cleaning them? Anything special?
Forget about cleaning them!

All that would do is possibly make them prettier but not work and better, in fact depending on how your cleaned them things could get worse.

If they are the problem it is because the rubber has broken down and lost its insulative properties--I.e. they are no longer containing the 15k to 20kV the coil outputs to inonise the gap. Replace them--it's a lousy $30 or so with shipping from the source I listed--just do it...
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SOLD! - 2003 GT, UPR X, FRPP 24lb/h, Magnaflow, PP 70mm TB & plenum, Delta Force tuned,
Steeda UDPs, Ralco flywheel, RAM HDX clutch, 3.73s, 262 rwHP/305 lb-ft.

New ride (7/1/2013) 1998 Mercedes SL500-5.0L 32V VVT 326/347 HP/tq
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Old 08-19-2013, 09:56 PM   #22
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Well I may just replace the boots then, 80k miles 10 year old car I suppose it wouldn't hurt, I replaced a COP early this year because a spark plug blew out and he just ordered one and replaced it.
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1998 cummins - 150hp injectors | FASS fuel kit | 4" straight pipe | 5" lift | BHAF | 20" wheels | edge juice w/ attitude | built auto trans with stall | closing in on 900tq | bigger turbo soon..

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Old 08-19-2013, 10:02 PM   #23
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Well I may just replace the boots then, 80k miles 10 year old car I suppose it wouldn't hurt, I replaced a COP early this year because a spark plug blew out and he just ordered one and replaced it.
When plugs blow out it is not uncommon for the COP to be physically damaged...
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SOLD! - 2003 GT, UPR X, FRPP 24lb/h, Magnaflow, PP 70mm TB & plenum, Delta Force tuned,
Steeda UDPs, Ralco flywheel, RAM HDX clutch, 3.73s, 262 rwHP/305 lb-ft.

New ride (7/1/2013) 1998 Mercedes SL500-5.0L 32V VVT 326/347 HP/tq
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Old 08-19-2013, 11:16 PM   #24
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If the engine runs strongly without misfiring under higher loads and lower rpms (accelerate briskly in 3rd from 35 mph) then it is highly unlikely the COPs are at issue. Instead check the plugs, COP boots for signs of hardening or cracking (or smelling "burned"). Also sticking, gummed up, injectors or a sticking EGR valve can cause the symptoms you describe.

How many miles of the car, when were the plugs/boots last changed?
There's definitely no misfiring, fortunately. But like I said, since I have the extra money (and I've been wanting a new ignition coil for better performance in that area) I went ahead and ordered one.

As for my injectors, I've never done any direct contact maintenance on those other than pouring some cleaner into the gas tank. There's a total of 126,700 miles on my car. I changed my plugs and boots around 4-6 months ago.
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Old 08-20-2013, 03:38 AM   #25
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Forget about cleaning them!

All that would do is possibly make them prettier but not work and better, in fact depending on how your cleaned them things could get worse.

If they are the problem it is because the rubber has broken down and lost its insulative properties--I.e. they are no longer containing the 15k to 20kV the coil outputs to inonise the gap. Replace them--it's a lousy $30 or so with shipping from the source I listed--just do it...
Glad that dude has the setup for the 5.4L Triton engines too, about to order a set myself and almost got the ones you linked for the Mustang lol.
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Old 08-20-2013, 05:55 PM   #26
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+1 on replacing the boots.

I replaced mine around 100k, and with my car at 180,000 its still running strong.
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